#include <bits/stdc++.h>
#define rep(i,n) for (int i = 0; i < (n); i ++)
using namespace std;
using ll = long long;
using PL = pair<ll,ll>;
using P = pair<int,int>;
constexpr int INF = 1000000000;
constexpr long long HINF = 1000000000000000;
constexpr long long MOD = 1000000007;// = 998244353;
constexpr double EPS = 1e-4;
constexpr double PI = 3.14159265358979;


template<class T> class BinaryIndexedTree {
    int N;
    vector<T> bit;
    
    public :
    BinaryIndexedTree(int _N): N(_N),bit(N + 1,0){
    }

    void add(int i,T x) {
        while (i <= N) {
            bit[i] += x;
            i += (i & -i);
        }
    }

    T sum(int i) {
        T ret = 0;
        while (i > 0) {
            ret += bit[i];
            i -= (i & -i);
        }
        return ret;
    }

    int lower_bound(T x) {
        if (x <= 0) return 0;
        int i = 0;
        int K = 1;
        while (2*K > N) K <<= 1;
        for (;K > 0; K >>= 1) {
            if (i + K <= N && bit[i + K] < x) {
                x -= bit[i + K];
                i += K;
            }
        }
        return i + 1;
    }
};

int main() {
    int N; cin >> N;
    vector<int> A(N),B(N),C(N + 1);
    rep(i,N) cin >> A[i];
    rep(i,N) cin >> B[i];
    rep(i,N) C[B[i]] = i;
    rep(i,N) A[i] = C[A[i]];
    

    BinaryIndexedTree<int> bit(N);
    ll ans = 0;
    rep(i,N) {
        ans += i - bit.sum(A[i] + 1);
        bit.add(A[i] + 1,1);
    }
    cout << ans << '\n';
    return 0;
}